<!--
 * @Description: 
 * @Author: charles
 * @Date: 2021-11-11 09:36:52
 * @LastEditors: charles
 * @LastEditTime: 2021-11-11 09:42:27
-->
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>入口</title>
  <script src="https://cdn.bootcdn.net/ajax/libs/react/17.0.2/umd/react.development.min.js"></script>
  <script src="https://cdn.bootcdn.net/ajax/libs/react-dom/17.0.2/umd/react-dom.development.min.js"></script>
  <script src="https://cdn.bootcss.com/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
  <div id="app"></div>

  <script type="text/babel">

    class Modal extends React.Component {
      constructor(props){
        super(props)
        this.el = document.createElement('div')
      }
      componentDidMount(){
        document.body.appendChild(this.el);
      }

      render(){
        return ReactDOM.createPortal(
          this.props.children,
          this.el
        )
      }
    }

  
    class App extends React.Component {
      render(){
        return (
          <div className="container">
            <h2>Protals</h2>
            <Modal>
              <div>
                <h2>模态框</h2>  
              </div>  
            </Modal>
          </div>
        )
      }
    }
    ReactDOM.render(<App/>,document.getElementById('app'))
  </script>
</body>
</html>
